High Efficiency Solid-state solar module based on mesoscopic

organometal halide perovskite

Fabio Matteocci1, Lucio Cinà1, Francesco Di Giacomo1, Stefano Razza1, Alessandro L. Palma1,

Andrea Guidobaldi1, Alessandra D’Epifanio2, Silvia Licoccia2, Thomas M. Brown1, Andrea

Reale1and Aldo Di Carlo1

1C.H.O.S.E. (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering,

University of Rome “Tor Vergata”,via del Politecnico 1, Rome, 00133 Italy.

2Department of Chemical Science and Technologies, University of Rome "Tor Vergata", Via della

Ricerca Scientifica 00133, Rome, Italy.

Figure S1. Image of the patterned BL-TiO2 layer using the lift off procedure

Figure S2. Average thickness value of BL-TiO2/nc-TiO2 substrates used in Batch III. The thicknesses were measured using a profilometer Dektak Veeco 150. The average values are calculated from a batch of 20 BL-TiO2/nc-TiO2 substrates.

Figure. S3 IPCE spectra of a constituent cell of the double-step based module obtained after encapsulation. A value of Jsc = 17.12 mA/cm2 can be calculated integrating the IPCE spectrum from

λ1=300 nm to λ2=900 nm using the AM1.5G spectra. The value extracted from measurements under the sun simulator was Jsc =17.56 mA/cm2 (see the inset graph).

The module photovoltaic parameters were: Voc = 4.07V, ISC = -44.43 mA, JSC= -17.63 mA/cm2, FF =58.5% and a PCE = 10.5%. The FF and Jsc values were lower respect to the I-V characteristic reported in the manuscript. This decrease could be ascribed to the thermal stress (100°C) during the sealing procedure using a thermoplastic sealant. Incident photon-to-current conversion efficiency (IPCE) was measured using an apparatus consistent of an amperometer (Keithley 2612) and a monochromator (Newport Mod. 74000).